My kids keep leaving lights on all the time. Mostly in their rooms, but also other rooms, where I don’t have energy efficient lighting. They weren’t always this way. To make a point about electric costs and being wasteful, I used to charge them 25¢ each time they left a light on in the bathroom or in their bedroom. At first, it was a nice offset to my utility bill, as they left the lights on frequently. After a period of time, I got less money, as their habits started to change. Over time, I stopped asking for payments, and over more time, their habits returned to forgetting to turn off lights and being wasteful again. Time to regroup.
I could start charging them again, but I felt we needed something different. Light bulb!!! I had an idea. I will educate them by showing them the utility bill, explain kilowatt hours and challenging them to a low utility bill. If it’s lower than our projected amount, they get a fun dinner at Gattitown. Also, because I thought they needed something tangible and a little out of pocket cost, I made them each buy 2 boxes of CF light bulbs. This would allow me to switch out more of the bulbs we use frequently to save on energy costs.
We got the bulbs at Aldi. They’re much cheaper there than anywhere else I could find. You don’t have to buy yours there, but at least look to find them on sale, as many of the major retailers will run sales on them. 
Aldi’s prices are half of what the other retailers charge for these. I couldn’t find much info on this On brand off brand. Ha! Get it? So far, these work as well as the other brands I have. And I do have some of these I’ve been using for a while and they work great.
First, we replaced the 6 bulbs in the kids bathroom. I replaced them with only 4 bulbs, and it’s still to bright, so much that the kids are complaining about it. I’ll take one out, and that will have decreased the bathroom lighting cost overall by 87.5%. Then I replaced all the lamp bulbs and the lights over my stove top. I tried to replace the kitchen halogen lights, which have the standard bulb socket, however these won’t work, as the ballast on the bulb is too large to fit in the opening. Bummer, because that would have been the biggest savings of all.
And don’t worry, I found a good home for all of the old bulbs, as they shouldn’t go to waste. :)